1020212021 has 4 divisors (see below), whose sum is σ = 1026968544. Its totient is φ = 1013455500.

The previous prime is 1020211991. The next prime is 1020212029. The reversal of 1020212021 is 1202120201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1020212021 - 2⁶ = 1020211957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020211993 and 1020212011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020212029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3378035 + ... + 3378336.

It is an arithmetic number, because the mean of its divisors is an integer number (256742136).

Almost surely, 2^1020212021 is an apocalyptic number.

It is an amenable number.

1020212021 is a deficient number, since it is larger than the sum of its proper divisors (6756523).

1020212021 is an equidigital number, since it uses as much as digits as its factorization.

1020212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6756522.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1020212021 is about 31940.7579903796. The cubic root of 1020212021 is about 1006.6924515103.

Adding to 1020212021 its reverse (1202120201), we get a palindrome (2222332222).

The spelling of 1020212021 in words is "one billion, twenty million, two hundred twelve thousand, twenty-one".